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linux-stable/arch/arm/include/asm
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Linus Torvalds 4356e9f841 work around gcc bugs with 'asm goto' with outputs 
We've had issues with gcc and 'asm goto' before, and we created a
'asm_volatile_goto()' macro for that in the past: see commits
3f0116c323 ("compiler/gcc4: Add quirk for 'asm goto' miscompilation
bug") and a9f180345f ("compiler/gcc4: Make quirk for
asm_volatile_goto() unconditional").

Then, much later, we ended up removing the workaround in commit
43c249ea0b ("compiler-gcc.h: remove ancient workaround for gcc PR
58670") because we no longer supported building the kernel with the
affected gcc versions, but we left the macro uses around.

Now, Sean Christopherson reports a new version of a very similar
problem, which is fixed by re-applying that ancient workaround.  But the
problem in question is limited to only the 'asm goto with outputs'
cases, so instead of re-introducing the old workaround as-is, let's
rename and limit the workaround to just that much less common case.

It looks like there are at least two separate issues that all hit in
this area:

 (a) some versions of gcc don't mark the asm goto as 'volatile' when it
     has outputs:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98619
        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110420

     which is easy to work around by just adding the 'volatile' by hand.

 (b) Internal compiler errors:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110422

     which are worked around by adding the extra empty 'asm' as a
     barrier, as in the original workaround.

but the problem Sean sees may be a third thing since it involves bad
code generation (not an ICE) even with the manually added 'volatile'.

but the same old workaround works for this case, even if this feels a
bit like voodoo programming and may only be hiding the issue.

Reported-and-tested-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/all/20240208220604.140859-1-seanjc@google.com/
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Uros Bizjak <ubizjak@gmail.com>
Cc: Jakub Jelinek <jakub@redhat.com>
Cc: Andrew Pinski <quic_apinski@quicinc.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-02-09 15:57:48 -08:00
..
hardware locomo: make locomo_bus_type constant and static 2024-01-04 14:38:57 +01:00
mach ARM: 9298/1: Drop custom mdesc->handle_irq() 2023-06-19 09:35:48 +01:00
vdso vdso/treewide: Add vdso_data pointer argument to __arch_get_hw_counter() 2020-08-06 10:57:30 +02:00
xen arm/xen: Introduce xen_setup_dma_ops() 2022-06-06 08:54:33 +02:00
arch_gicv3.h arm64: add ARM64_HAS_GIC_PRIO_RELAXED_SYNC cpucap 2023-01-31 16:06:17 +00:00
arch_timer.h clocksource/drivers/arm_arch_timer: Drop unnecessary ISB on CVAL programming 2021-10-17 21:47:44 +02:00
archrandom.h random: remove CONFIG_ARCH_RANDOM 2022-07-18 15:03:37 +02:00
arm-cci.h
arm_pmuv3.h arm64/arm: arm_pmuv3: perf: Don't truncate 64-bit registers 2023-11-07 11:00:57 +00:00
asm-offsets.h
assembler.h locking/atomic: arm: fix sync ops 2023-06-05 09:57:13 +02:00
atomic.h locking/atomic: arm: add preprocessor symbols 2023-06-05 09:57:15 +02:00
auxvec.h
barrier.h
bitops.h arm: align find_bit declarations with generic kernel 2022-07-14 15:21:43 -07:00
bitrev.h
bL_switcher.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
bug.h arm: print alloc free paths for address in registers 2021-05-07 00:26:34 -07:00
bugs.h ARM: cpu: Switch to arch_cpu_finalize_init() 2023-06-16 10:15:59 +02:00
cache.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheflush.h mm: Introduce flush_cache_vmap_early() 2023-12-14 00:23:17 -08:00
cachetype.h
checksum.h net: checksum: drop the linux/uaccess.h include 2023-01-27 11:19:46 +00:00
clocksource.h arm: Introduce asm/vdso/clocksource.h 2020-03-21 15:23:54 +01:00
cmpxchg.h locking/arch: Rename all internal __xchg() names to __arch_xchg() 2023-04-29 09:08:44 +02:00
compiler.h
cp15.h arm: vdso: Enable arm to use common headers 2020-03-21 15:24:03 +01:00
cpu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cpufeature.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cpuidle.h arm64 updates for 5.14 2021-06-28 14:04:24 -07:00
cputype.h ARM: 9267/1: Define Armv8 registers in AArch32 state 2022-11-28 11:57:31 +00:00
cti.h
current.h ARM: make get_current() and __my_cpu_offset() __always_inline 2022-01-31 16:06:35 +01:00
dcc.h
delay.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
device.h ARM/dma-mapping: remove the dma_coherent member of struct dev_archdata 2022-10-06 14:31:08 +02:00
div64.h ARM: 9118/1: div64: Remove always-true __div64_const32_is_OK() duplicate 2021-08-20 11:39:28 +01:00
dma-iommu.h ARM/dma-mapping: const a pointer to bus_type in arm_iommu_create_mapping() 2023-03-23 13:21:51 +01:00
dma.h ARM: 9323/1: mm: Fix ARCH_LOW_ADDRESS_LIMIT when CONFIG_ZONE_DMA 2023-10-05 16:15:42 +01:00
dmi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
domain.h ARM: 9326/1: make <linux/uaccess.h> self-contained for ARM 2023-10-05 16:17:05 +01:00
ecard.h
edac.h
efi.h efi: Discover BTI support in runtime services regions 2023-02-04 09:19:02 +01:00
elf.h ARM: module: implement support for PC-relative group relocations 2021-12-06 12:49:16 +01:00
exception.h ARM: 9320/1: fix stack depot IRQ stack filter 2023-10-05 16:15:40 +01:00
fb.h arch/arm: Implement <asm/fb.h> with generic helpers 2023-04-20 10:04:24 +02:00
fiq.h
firmware.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
fixmap.h ARM updates for 5.11: 2020-12-22 13:34:27 -08:00
floppy.h floppy: split the base port from the register in I/O accesses 2020-05-12 19:34:52 +03:00
fncpy.h
fpstate.h ARM: 9228/1: vfp: kill vfp_flush/release_thread() 2022-08-31 14:50:08 +01:00
ftrace.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
futex.h ARM: futex: Address build warning 2020-05-07 00:41:47 +02:00
glue-cache.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
glue-df.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
glue-pf.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
glue-proc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
glue.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
hardirq.h ARM: irqstat: Get rid of duplicated declaration 2020-11-23 10:31:05 +01:00
highmem.h ARM: highmem: Fix cache_is_vivt() reference 2020-12-04 23:35:34 +01:00
hugetlb-3level.h
hugetlb.h arm: include asm/cacheflush.h in asm/hugetlb.h 2023-08-21 13:38:00 -07:00
hw_breakpoint.h ARM: 8927/1: ARM/hw_breakpoint: add more ARMv8 debug architecture versions support 2019-11-15 22:21:08 +00:00
hw_irq.h
hwcap.h
hypervisor.h arm/arm64: Probe for the presence of KVM hypervisor 2021-03-31 09:16:55 +01:00
idmap.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
insn.h ARM: 9176/1: avoid literal references in inline assembly 2022-01-06 12:58:58 +00:00
io.h asm/io: remove unnecessary xlate_dev_mem_ptr() and unxlate_dev_mem_ptr() 2023-11-23 10:37:40 +01:00
irq.h nmi_backtrace: allow excluding an arbitrary CPU 2023-08-18 10:19:00 -07:00
irq_work.h arch: consolidate arch_irq_work_raise prototypes 2023-11-23 11:32:29 +01:00
irqflags.h
jump_label.h work around gcc bugs with 'asm goto' with outputs 2024-02-09 15:57:48 -08:00
kasan.h ARM: 9016/2: Initialize the mapping of KASan shadow memory 2020-10-27 12:11:10 +00:00
kasan_def.h ARM: 9015/2: Define the virtual space of KASan's shadow region 2020-10-27 12:11:08 +00:00
Kbuild local64.h: make <asm/local64.h> mandatory 2020-12-29 15:36:49 -08:00
kexec-internal.h ARM: kexec: fix oops after TLB are invalidated 2021-02-05 10:23:29 +00:00
kexec.h kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP 2023-12-06 16:12:48 -08:00
kfence.h ARM: 9166/1: Support KFENCE for ARM 2021-12-17 11:34:38 +00:00
kgdb.h
kprobes.h kprobes: unify kprobes_exceptions_nofify() prototypes 2023-11-10 19:59:05 +09:00
krait-l2-accessors.h
linkage.h
mc146818rtc.h
mcpm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mcs_spinlock.h
memblock.h
memory.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
mmu.h ARM: mm: make vmalloc_seq handling SMP safe 2022-01-25 09:53:52 +01:00
mmu_context.h ARM: mm: make vmalloc_seq handling SMP safe 2022-01-25 09:53:52 +01:00
module.h ARM: 9252/1: module: Teach unwinder about PLTs 2022-11-07 14:18:59 +00:00
module.lds.h kbuild: preprocess module linker script 2020-09-25 00:36:41 +09:00
mpu.h
mtd-xip.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
neon.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nwflash.h misc: move FLASH_MINOR into miscdevice.h and fix conflicts 2020-03-18 12:27:04 +01:00
opcodes-sec.h
opcodes-virt.h
opcodes.h ARM: 9145/1: patch: fix BE32 compilation 2021-10-25 13:12:36 +01:00
outercache.h
page-nommu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
page.h asm-generic updates for 6.5 2023-07-06 10:06:04 -07:00
paravirt.h x86/paravirt: Switch time pvops functions to use static_call() 2021-03-11 16:17:52 +01:00
paravirt_api_clock.h sched/headers: ARM needs asm/paravirt_api_clock.h too 2022-03-22 08:53:10 +01:00
patch.h
pci.h PCI: Remove pci_get_legacy_ide_irq() and asm-generic/pci.h 2022-07-22 17:23:45 -05:00
percpu.h ARM: make get_current() and __my_cpu_offset() __always_inline 2022-01-31 16:06:35 +01:00
perf_event.h ARM: 9251/1: perf: Fix stacktraces for tracepoint events in THUMB2 kernels 2022-11-07 14:16:43 +00:00
pgalloc.h mm/thp: define default pmd_pgtable() 2021-07-01 11:06:03 -07:00
pgtable-2level-hwdef.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pgtable-2level-types.h
pgtable-2level.h arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE 2023-02-02 22:33:06 -08:00
pgtable-3level-hwdef.h
pgtable-3level-types.h
pgtable-3level.h mm: Rename arch pte_mkwrite()'s to pte_mkwrite_novma() 2023-07-11 14:10:56 -07:00
pgtable-hwdef.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pgtable-nommu.h MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
pgtable.h mm: Introduce pudp/p4dp/pgdp_get() functions 2023-12-20 10:48:13 -08:00
probes.h
proc-fns.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
processor.h kernel: exit: cleanup release_thread() 2022-09-11 21:55:07 -07:00
procinfo.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
prom.h ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address 2020-10-27 12:10:59 +00:00
psci.h
ptdump.h ARM: 9255/1: efi/dump UEFI runtime page tables for ARM 2022-11-07 14:19:01 +00:00
ptrace.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
seccomp.h arm: Enable seccomp architecture tracking 2020-11-20 11:16:34 -08:00
sections.h arm: Remove HYP/Stage-2 page-table support 2020-03-24 10:56:05 +00:00
secure_cntvoff.h
semihost.h serial: earlycon-arm-semihost: Move smh_putc() variants in respective arch's semihost.h 2023-01-19 14:58:19 +01:00
set_memory.h ARM: 9164/1: mm: Provide set_memory_valid() 2021-12-17 11:34:36 +00:00
setup.h vgacon: clean up global screen_info instances 2023-10-17 10:17:02 +02:00
shmparam.h
signal.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
simd.h ARM: 9283/1: permit non-nested kernel mode NEON in softirq context 2023-01-11 16:21:21 +00:00
smp.h ARM: smp: Switch to hotplug core state synchronization 2023-05-15 13:44:57 +02:00
smp_plat.h
smp_scu.h
smp_twd.h
sparsemem.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
spectre.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
spinlock.h locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
spinlock_types.h locking: Allow to include asm/spinlock_types.h from linux/spinlock_types_raw.h 2021-12-07 15:14:12 +01:00
stackprotector.h stackprotector: actually use get_random_canary() 2022-11-18 02:18:10 +01:00
stacktrace.h ARM: 9258/1: stacktrace: Make stack walk callback consistent with generic code 2022-11-08 18:36:18 +00:00
string.h ARM: 9014/2: Replace string mem* functions for KASan 2020-10-27 12:11:06 +00:00
suspend.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
swab.h
switch_to.h ARM development updates for 5.18: 2022-03-23 17:35:57 -07:00
sync_bitops.h locking/atomic: arm: fix sync ops 2023-06-05 09:57:13 +02:00
syscall.h ARM: ptrace: Restore syscall skipping for tracers 2023-08-16 13:58:49 -07:00
syscalls.h ARM: 9309/1: add missing syscall prototypes 2023-06-19 09:35:55 +01:00
system_info.h
system_misc.h ARM: 9096/1: Remove arm_pm_restart() 2021-06-13 18:16:48 +01:00
tcm.h ARM: 9314/1: tcm: move tcm_init() prototype to asm/tcm.h 2023-06-19 09:35:59 +01:00
therm.h
thread_info.h ARM: iwmmxt: Use undef hook to enable coprocessor for task 2023-05-17 15:08:22 +02:00
thread_notify.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
timex.h arm: use fallback for random_get_entropy() instead of zero 2022-05-13 23:59:23 +02:00
tlb.h arm: convert various functions to use ptdescs 2023-08-21 13:37:55 -07:00
tlbflush.h arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
tls.h ARM: smp: elide HWCAP_TLS checks or __entry_task updates on SMP+v6 2022-01-25 09:53:52 +01:00
topology.h sched/topology: Add a new arch_scale_freq_ref() method 2023-12-23 15:52:34 +01:00
traps.h ARM: 9326/1: make <linux/uaccess.h> self-contained for ARM 2023-10-05 16:17:05 +01:00
uaccess-asm.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
uaccess.h ARM: 9326/1: make <linux/uaccess.h> self-contained for ARM 2023-10-05 16:17:05 +01:00
ucontext.h ARM: ep93xx: remove MaverickCrunch support 2021-08-04 13:30:04 +02:00
unified.h ARM: 9116/1: unified: Remove check for gcc < 4 2021-08-20 11:39:28 +01:00
unistd.h clone3-v5.3 2019-07-11 10:09:44 -07:00
unwind.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
uprobes.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
user.h asm/user.h: killed unused macros 2022-01-30 21:17:00 -05:00
v7m.h irqchip: nvic: Use GENERIC_IRQ_MULTI_HANDLER 2021-12-06 12:49:16 +01:00
vdso.h arch: vdso: consolidate gettime prototypes 2023-11-23 11:32:32 +01:00
vdso_datapage.h ARM: 8930/1: Add support for generic vDSO 2019-11-15 22:21:12 +00:00
vermagic.h arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h> 2020-04-23 10:50:26 +09:00
vfp.h Revert part of ae1f8d793a ("ARM: 9304/1: add prototype for function called only from asm") 2023-08-15 10:07:48 +01:00
vfpmacros.h ARM: 8991/1: use VFP assembler mnemonics if available 2020-07-21 16:33:39 +01:00
vga.h console: fix up ARM screen_info reference 2023-10-17 16:34:02 +02:00
virt.h arm: Remove the ability to set HYP vectors outside of the decompressor 2020-03-24 10:56:05 +00:00
vmalloc.h mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h> 2019-12-10 10:12:55 +01:00
vmlinux.lds.h objtool/idle: Validate __cpuidle code as noinstr 2023-01-13 11:48:15 +01:00
word-at-a-time.h
xor.h ARM: 9260/1: lib/xor: use r10 rather than r7 in xor_arm4regs_{2|3} 2022-11-07 14:19:03 +00:00